I'm trying to waterproof the top edges of some wooden bathroom cabinet doors
that get dripped on from the sink top. The top edges are beveled at 45
degree angle to the counter top so the wood is kind of rough rather than
well finished. The Minwax polyurethane I'm using just sinks into the wood
and is absorbed rather than drying to form the clear barrier I'm looking
for.

Is there another product I should try-- or just keep adding additional coats
of polyurethane?